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I have done what you said, but trying running one of your amps and see what happens when you apply 18+ volts to the collector. I generally like to bias a 2 pill section at right around 225ma. Maybe 250ma max. at 12-15 volts, What I meant in earlier post, is that if you overvolt an amplifier like 18 heck I've done 19.5 Volts. At the lower voltage that you set bias point at, it will change with an increase in voltage on output. But yes you are right, a good stable bias circuit should remain stable and should only drop when it is tracking temp., and purposely trying to decrease forward bias so that thermal runaway is not encountered. Otherwise it will become a current hog quickly and that magic 10 ohm smoke will be seen. I did not explain myself correctly earlier. Sorry about that.

[QUOTE="Crusher, post: 158406, member: 3746"] I have done what you said, but trying running one of your amps and see what happens when you apply 18+ volts to the collector. I generally like to bias a 2 pill section at right around 225ma. Maybe 250ma max. at 12-15 volts, What I meant in earlier post, is that if you overvolt an amplifier like 18 heck I've done 19.5 Volts. At the lower voltage that you set bias point at, it will change with an increase in voltage on output. But yes you are right, a good stable bias circuit should remain stable and should only drop when it is tracking temp., and purposely trying to decrease forward bias so that thermal runaway is not encountered. Otherwise it will become a current hog quickly and that magic 10 ohm smoke will be seen. I did not explain myself correctly earlier. Sorry about that. [/QUOTE]

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